I can confirm being able to successfully tether an 8330 (system 4.5.0 using Blackberry Desktop Manager for Mac) to a MacBook Pro running 10.6.2 via both USB and Bluetooth DUN but speeds are slower than when I was running 10.5. Bluetooth is about 250-300k download and 125k upload. USB is about 70k download and 125k upload. The USB connection often dips to unusable speeds (10k download).